Which of the following may occur as a result of an increase in the price of cell phones?
a. increase in supply
b. increase in quantity supplied
c. decrease in supply
d. decrease in quantity supplied

Also, if its okay I need help with this too:
Use the above graph to answer the following question.
Which situation could cause the market for books to shift from line 1 to line 2?
a. an increase in the price of books
b. a fire that destroys the paper factories
c. a decrease in the price of book binding glue
d. a celebrity commercial encouraging reading